decline in WordNet English dictionary

1. go down in value
   "the stock market corrected"; "prices slumped"
   decline  slump  correct 
   
2. grow smaller
   "Interest in the project waned"
   decline  go down  wane 
   
3. grow worse
   "Conditions in the slum worsened"
   worsen  decline 
   
4. show unwillingness towards
   "he declined to join the group on a hike"
   refuse  decline 
   
5. inflect for number, gender, case, etc., "in many languages, speakers decline nouns, pronouns, and adjectives"
   decline 
   
6. go down
   "The roof declines here"
   decline 
   
7. refuse to accept
   "He refused my offer of hospitality"
   refuse  reject  pass up  turn down  decline 
   

1. a gradual decrease; as of stored charge or current
   decay  decline 
   
2. a downward slope or bend
   descent  declivity  fall  decline  declination  declension  downslope 
   
3. a condition inferior to an earlier condition; a gradual falling off from a better state
   decline  declination 
   
4. change toward something smaller or lower
   decline  diminution